*{ 
margin:0; 
padding:0; 
} 
body{ 
background-color:gray; 
} 
.clear{ 
clear:both; 
} 
/*head*/ 
#head{ 
background-color:blue; 
height:150px; 
} 
/*container*/ 
#container{ 
background-color:red; 
width:960px; 
height:800px; 
margin:20px auto; 
} 
/*content*/ 
#content{ 
background-color:yellow; 
float:left; 
width:685px; 
height:100%; 
} 
/*side*/ 
#side{ 
background-color:green; 
float:right; 
width:255px; 
height:100%; 
} 
/*foot*/ 
#foot{ 
background-color:white; 
height:150px; 
width:960px; 
margin:20px auto; 
} 